XSS in Rocket.chat
CVE-2026-65644
Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6, 8.3.8, 8.2.8, 8.1.8, and 7.10.15 has a REST API endpoint POST /api/v1/livechat/visitor that accepts an unauthenticated, unsanitized name field for Livechat visitors. This name is stored raw and later rendered via dangerouslySetInnerHTML in the Omnichannel Queue side panel (InquireSidePanelItem.tsx), injecting a real, clickable HTML link - pointing to any attacker-controlled domain, with arbitrary social-engineering text - into the DOM of any agent viewing the queue.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Rocket.chat — versions 8.7.0
Weakness classification (CWE)
References
- hackerone.com/reports/3872858 (Third Party Advisory, Issue Tracking)
- github.com/RocketChat/Rocket.Chat/pull/41595 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-65644?
- CVE-2026-65644 is a high-severity vulnerability in Rocket.chat, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-08-21.
- How severe is CVE-2026-65644?
- High severity. CVSS v3 base score is 7.5 out of 10.